Introduction

[The505SHO]

Hello all,

I just purchased a 2012 SHO with the PP. Tuned with an air raid and I love this thing! I am hoping to get 150k miles out of it (currently at 74k) no cold start rattle and rides smooth. Does have the propane smell at shutdown. Hoping new fluid takes care of the PTU.


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[SM105K]

Hello all,

I just purchased a 2012 SHO with the PP. Tuned with an air raid and I love this thing! I am hoping to get 150k miles out of it (currently at 74k) no cold start rattle and rides smooth. Does have the propane smell at shutdown. Hoping new fluid takes care of the PTU.


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Welcome. Get the PTU fluid swapped ASAP. Here is a good explanation how they fail.

Here is a very good explanation by a member on here named Mr.HighCaliber.


"PTU's don't fail at least not from a power handling perspective. These only fail from lack of maintenance. Spun bearings and galling of the gears from lack of lubrication.

High Heat dries up the lighter oil molecules in the ****, which causes more heat due to lack of lubrication (thermal runaway) which leads to the remaining gear oil turning to thick black paste which clogs up the vent tube in the ptu which cause pressure buildup in the ptu which forces the remaining, non-congealed fluid out past the shaft seals. Now the only left is a thick paste thats easily flung off of the gears, sticking only to the case. After this chain of events, the bearings run dry and begin to fail, next are the gears. Tolerances widen or things begin to sieze. Bearing and gear noise are usually the first signs of mechanical failure.

But the PTU internals are stout. The weakest part of our powertrain is the RDU Atc coupler. (The electronic coupler in the rear differential). At least in terms of tq capacity and power handling."

 

[The505SHO]

Going to change it this upcoming Monday! Previous owner said it was changed at 45k.


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